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1 package com.thoughtworks.xstream.core;
2
3 import com.thoughtworks.xstream.alias.ClassMapper;
4 import com.thoughtworks.xstream.converters.Converter;
5 import com.thoughtworks.xstream.converters.ConverterLookup;
6 import com.thoughtworks.xstream.converters.basic.AbstractBasicConverter;
7 import com.thoughtworks.xstream.core.util.ObjectIdDictionary;
8 import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
9 import com.thoughtworks.xstream.io.path.PathTracker;
10 import com.thoughtworks.xstream.io.path.PathTrackingWriter;
11 import com.thoughtworks.xstream.io.path.RelativePathCalculator;
12
13 public class ReferenceByXPathMarshaller extends TreeMarshaller {
14
15 private PathTracker pathTracker = new PathTracker();
16 private ObjectIdDictionary references = new ObjectIdDictionary();
17 private RelativePathCalculator relativePathCalculator = new RelativePathCalculator();
18
19 public ReferenceByXPathMarshaller(HierarchicalStreamWriter writer, ConverterLookup converterLookup, ClassMapper classMapper) {
20 super(writer, converterLookup, classMapper);
21 this.writer = new PathTrackingWriter(writer, pathTracker);
22 }
23
24 public void convertAnother(Object  item) {
25 Converter converter = converterLookup.lookupConverterForType(item.getClass());
26
27 if (isImmutableBasicType(converter)) {
28 converter.marshal(item, writer, this);
30 } else {
31 String currentPath = pathTracker.getCurrentPath();
32 String pathOfExistingReference = references.lookupId(item);
33 if (pathOfExistingReference != null) {
34 String absolutePath = relativePathCalculator.relativePath(currentPath, pathOfExistingReference);
35 writer.addAttribute("reference", absolutePath);
36 } else {
37 references.associateId(item, currentPath);
38 converter.marshal(item, writer, this);
39 }
40 }
41 }
42
43 private boolean isImmutableBasicType(Converter converter) {
44 return converter instanceof AbstractBasicConverter;
45 }
46 }
47 |
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